nptel.ac.in
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NPTEL (National Programme on Technology Enhanced Learning) offers free online engineering and science courses from IITs and IISc, featuring lecture videos, downloadable notes, assignments, and exams, with optional certificates upon completion.
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mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram Research, featuring in-depth articles on topics from algebra and geometry to calculus and discrete math. Each entry includes clear explanations, definitions, theorems, formulas, and diagrams to illuminate mathematical concepts.
ocw.mit.edu
MIT OpenCourseWare provides free, openly accessible MIT course materials—including lecture notes, assignments, exams, and video lectures—across hundreds of subjects. It enables self-paced learning and exploration of MIT courses without registration.